Colorspace is always RGB

[renjith]

Hello,
We are trying to determine the colorspace of a pdf document programmatically using C# with spire.pdf. Unfortunately, we are only receiving RGB as the color space. Below an example to reproduce the issue.

Code: Select all

           var pdfDoc = new PdfDocument() {ColorSpace = PdfColorSpace.GrayScale};

            var page = pdfDoc.Pages.Add();
            page.Canvas.DrawString("Grayscale text", new PdfFont(PdfFontFamily.Courier, 12f), new PdfSolidBrush(Color.Red), 10, 10  );

            pdfDoc.SaveToFile(@"C:\temp\Grayscale.pdf");
            pdfDoc.Close();

            var pdfOpen = new PdfDocument(@"C:\temp\Grayscale.pdf");
            Console.WriteLine(pdfOpen.ColorSpace.ToString());
            pdfOpen.Close();

Not sure if we are missing anything here, could not find much help on color space anywhere.

Regards
Renjith

[Simon.yang]

Hello Renjith,

Thanks for your inquiry.
The default value of the ColorSpace is always RGB. When you set the value of the ColorSpace, it just set the color style of your new drawing. It won't save the value to the document. So while you load the document, it will print "RGB" to the screen as its default value.

Sincerely,
Simon
E-iceblue support team

[renjith]

Thank you for the update Simon. I have another related question. Is there any way to check if a pdf document has color content in it (other than grayscale content) ?

Thanks
Renjith

[Simon.yang]

Hello Renjith,

You can transfer the Pdf document into picture first through Sprie.Pdf. Then detect whether the picture has the color.
https://www.e-iceblue.com/Tutorials/Spi ... -code.html

Sincerely,
Simon
E-iceblue support team

[mtceegee]

Hello Renjith,

Thanks for your inquiry.
The default value of the ColorSpace is always RGB. When you set the value of the ColorSpace, it just set the color style of your new drawing. It won't save the value to the document. So while you load the document, it will print "RGB" to the screen as its default value.

Sincerely,
Simon
E-iceblue support team

Is there a way to set the ColorSpace such that it exports the PDF in CMYK format?

[Brian.Li]

Hello,

Thanks for your inquiry.
We are very sorry that our Spire.PDF doesn't support setting the ColorSpace as you mentioned. If there is anything else we can do for you, please feel free to contact us. Apologize for the inconvenience caused.

Sincerely,
Brian
E-iceblue support team